> > I'm not experienced with trannies but need to find some docs on building > > them. All the suppliers Ive tried wont touch it. > > And they *are* experienced. That tell you anything? Or been to the wrong sort. There are many comapnys that do transformers but at lline frequency for power or audio. There aren't many doing switch mode, but the are about and would do 3Kw @ 100Khz. BTW, SMPSUs at this power are known at nearer 1Mhz, such is the state of the art. -- Veronica Merryfield, somewhere in Cambridgeshire, UK "The best things in life aren't things" -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics